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grain boundary engineering for enhancing intergranular damage resistance of ferritic/martensitic steel P92

Nuclear Science and Techniques 2024年第5期35卷 186-199页

作者： Lei Peng Shang-Ming Chen Jing-Yi Shi Yong-Jie Sun Yi-Fei Liu Yin-Zhong Shen Hong-Ya He Hui-Juan Wang Jie Tian State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China School of Materials engineering Shanghai University of Engineering Science333 Long Teng RoadShanghai 201620China Experimental Center of engineering and Material Science University of Science and Technology of ChinaHefei 230026China

Ferritic/martensitic(F/M)steel is widely used as a structural material in thermal and nuclear power ***,it is susceptible to intergranular damage,which is a critical issue,under service *** this study,to improve the resistance to intergranular damage of F/M steel,a thermomechanical process(TMP)was employed to achieve a grain boundary engineering(GBE)microstructure in F/M steel *** TMP,including cold-rolling thickness reduction of 6%,9%,and 12%,followed by austenitization at 1323 K for 40 min and tempering at 1053 K for 45 min,was applied to the as-received(AR)P92 *** prior austenite grain(PAG)size,prior austenite grain boundary character distribution(GBCD),and connectivity of prior austenite grain boundaries(PAGBs)were *** to the AR specimen,the PAG size did not change *** fraction of coincident site lattice boundaries(CSLBs,3≤Σ≤29)and Σ3^(n) boundaries along PAGBs decreased with increasing reduction ratio because the recrystallization fraction increased with increasing reduction *** PAGB connectivity of the 6%deformed specimen slightly deteriorated compared with that of the AR ***,potentiodynamic polarization studies revealed that the intergranular damage resistance of the studied steel could be improved by increasing the fraction of CSLBs along the PAGBs,indicating that the TMP,which involves low deformation,could enhance the intergranular damage resistance.

关键词： grain boundary engineering Ferritic/martensitic steel Prior austenite grain boundary character distribution grain boundary connectivity Intergranular damage resistance

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Application of grain boundary engineering to Improve Intergranular Corrosion Resistance in a Fe–Cr–Mn–Mo–N High-Nitrogen and Nickel-Free Austenitic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 789-798页

作者： Feng Shi Ruo-Han Gao Xian-Jun Guan Chun-Ming Liu Xiao-Wu Li Department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China

Optimization of grain boundary engineering(GBE) process is explored in a Fe–20Cr–19Mn–2Mo–0.82N high-nitrogen and nickel-free austenitic stainless steel, and its intergranular corrosion(IGC) property after GBE treatment is experimentally evaluated. The proportion of low Σ coincidence site lattice(CSL) boundaries reaches 79.4% in the sample processed with 5% cold rolling and annealing at 1423 K for 72 h;there is an increase of 32.1% compared with the solution-treated sample. After grain boundary character distribution optimization, IGC performance is noticeably improved. Only Σ3 boundaries in the special boundaries are resistant to IGC under the experimental condition. The size of grain cluster enlarges with increasing fraction of low ΣCSL boundaries, and the amount of Σ3 boundaries interrupting the random boundary network increases during growth of the clusters, which is the essential reason for the improvement of IGC resistance.

关键词： High-nitrogen and nickel-free austenitic stainless steel grain boundary engineering Electron backscatter diffraction(EBSD) LowΣcoincidence site lattice boundary Intergranular corrosion

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A pathway to improve low-cycle fatigue life of face-centered cubic metals via grain boundary engineering

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Journal of Materials Science & Technology 2022年第18期113卷 82-89页

作者： X.J.Guan Z.P.Jia S.M.Liang F.Shi X.W.Li Department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

To probe a pathway to improve the low-cycle fatigue life of face-centered cubic(FCC)metals via grain boundary engineering(GBE),the tension-tension fatigue tests were carried out on the non-GBE and GBE Cu-16 at.%Al alloys at relatively high stress *** results indicate that the cyclic strain localiza-tion and cracking at grain boundaries(GBs)can be effectively suppressed,especially at increased stress amplitude,by an appropriate GBE treatment that can result in a higher resistance to GB cracking and a greater capability of compatible ***,the sensitivity of fatigue life to stress amplitude can be weakened by GBE,and the low-cycle fatigue life of Cu-16 at.%Al alloys is thus distinctly improved.

关键词： Cu-Al alloy grain boundary engineering Fatigue life Crack nucleation Stress amplitude

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Effect of grain boundary engineering on the Work Hardening Behavior of AL6XN Super‑Austenitic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 681-693页

作者： X.J.Guan Z.P.Jia M.A.Nozzari Varkani X.W.Li Department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

To examine the influence of grain boundary engineering(GBE)on the work hardening behavior,the tensile tests were carried out on the non-GBE and GBE AL6XN super-austenitic stainless steel(ASS)samples with a comparable grain size at two strain rates of 10^(-2)s^(-1)and 10^(-4)s^(-1).The evolution of deformation microstructures was revealed by transmission electron microscopy(TEM)and quasi-in situ electron backscatter diffraction(EBSD)*** results show that the influence of GBE on the mechanical properties of AL6XN super-ASS is mainly manifested in the change of work hardening *** the early stage of plastic deformation,GBE samples show a slightly lowered work hardening rate,since the special grain boundaries(SBs)of a high fraction induce a higher dislocation free path and a weaker back stress;however,with increasing plastic deformation amount,the work hardening rate of GBE samples gradually surpasses that of non-GBE samples due to the better capacity of maintainable work hardening that is profited from the inhibited dislocation annihilation by *** a word,the enhanced capacity of sustained work hardening effectively postpones the appearance of necking point and thus efficaciously ameliorates the ductility of GBE samples under the premise of little changes in yield strength and ultimate tensile strength.

关键词： AL6XN super-austenitic stainless steel grain boundary engineering Work hardening behavior Quasi-in situ observation Ductility

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Retarding the precipitation of η phase in Fe-Ni based alloy through grain boundary engineering

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Journal of Materials Science & Technology 2020年第12期47卷 152-161页

作者： Honglei Hu Mingjiu Zhao Lijian Rong Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and engineering University of Science and Technology of China96 Jinzhai RoadHefei 230026China

It is important to inhibit the precipitation of η phases in precipitation strengthened Fe-Ni based alloys,as they will deteriorate not only the mechanical property but also the hydrogen *** present investigation shows that grain boundary engineering(GBE) can retard the formation and growth of ηphase in J75 *** GBE treatment with 5% cold rolling followed by annealing at 1000℃ for 1 h,the fraction of special boundaries(SBs) increases from 38.4% in conventional alloy to 77.2% and the fraction of special triple junctions increases from 10% to 74%.During 800℃ aging treatment,quite amount of cellular η phases adjacent to random grain boundary(RGB) will be found in conventional alloy,and only a few small η phases have been observed in GBE treatment alloy subjected to the same aging treatment for long *** reason for GBE in inhibiting precipitation of η phase can be attributed to not only introducing high fraction of SBs but also breaking the connectivity of RGB *** nucleation and growth of η phases on SBs are difficult due to their lower Ti concentration and diffusion rate,and the disruption of RGB networks reduces supply of Ti atoms to the η phases significantly,which impedes their growth at RGB.

关键词： Fe-Ni based alloy ηphase Precipitation behavior Random grain boundary connectivity grain boundary engineering boundary diffusion

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Improvement of Intergranular Stress Corrosion Crack Susceptibility of Austenite Stainless Steel through grain boundary engineering

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Journal of Materials Science & Technology 2007年第6期23卷 785-789页

作者： Weizhong JIN Sen YANG Hiroyuki KOKAWA Zhanjie WANG Yutaka S.Sato Department of Materials Processing Graduate School of Engineering Tohoku University Aoba-yama 6-6-02 Sendai 980-8579 Japan College of Materials Science and engineering Inner Mongolia University of Technology Hohhot 010051 China

Intergranular stress corrosion crack susceptibility of austenite stainless steel was evaluated through threepoint bending test conducted in high temperature water. The experimental results showed that the frequent and efficient introduction of low energy coincidence site lattice boundaries through grain boundary engineering resulted in an apparent improvement of the intergranular stress corrosion crack resistance of austenite stainless steel.

关键词： Intergranular stress corrosion cracking grain boundary engineering Coincidence site lattice Austenite stainless steel

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Improving the Performance of Thermoelectric Materials by Atomic Layer Deposition-based grain boundary engineering

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Chinese Journal of Structural Chemistry 2020年第5期39卷 831-837页

作者： LI Shuan-Kui ZHU Wei-Ming XIAO Yin-Guo PAN Feng School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China

Thermoelectric materials can directly achieve the conversion between heat and electricity,providing a clean and reliable way to alleviate energy ***,the wide use of thermoelectric materials is subjected to their low energy conversion *** boundary engineering is considered as an effective strategy to improve thermoelectric performance,particularly for the most polycrystalline thermoelectric materials in bulk ***,the precise controlling over the microstructure and composition of grain boundary at atomic scale has been achieved by atomic layer deposition(ALD)technology,which has been confirmed in various thermoelectric materials,such as Bi2Te2.7Se0.3,Bi0.4Sb1.6Te3,and ***,it is demonstrated that the decoupling between three key thermoelectric parameters,*** coefficient,electrical conductivity and thermal conductivity,can be realized by ALD-based grain boundary ***,these key parameters can be optimized simultaneously toward the desired direction,which is extremely important for improving the thermoelectric *** this review,the relevant progress on the grain boundary engineering by ALD-based strategy is reviewed and some prospects are proposed.

关键词： grain boundary engineering atomic layer deposition thermoelectric materials

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Tailoring hydrogen embrittlement resistance of pure Ni by grain boundary engineering

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Corrosion Communications 2022年第2期6卷 48-51页

作者： Qingqing Sun Jinhua Han Jiaxing Li Fahe Cao Shuai Wang Department of Mechanical and Energy engineering Southern University of Science and Technology School of Materials Sun Yat-sen University

By using thermo-mechanical processing, 99.996 wt.% pure Ni with different grain boundary characteristics were fabricated(Sample #1, 700℃ × 10 h + cold rolling reduction 50%+ 650℃ × 2 h; Sample #2, 700℃ × 10 h + cold rolling reduction 50%+ 900℃ × 5 min). Hydrogen embrittlement sensitivity of the two samples was determined by using high-pressure hydrogen charging, low strain rate tensile test and SEM fractography. Compared with Sample #1, hydrogen embrittlement index of Sample #2 increased from 0.52 to 0.71. The effects of grain size,grain boundary type and grain boundary curviness on hydrogen embrittlement of pure Ni were discussed. The results indicate that: 1) special grain boundaries including twin grain boundaries may have a marginal effect on tailoring hydrogen embrittlement resistance in pure Ni; 2) increasing grain boundary curviness is an effective way to improve hydrogen embrittlement resistance of Ni.

关键词： Alloy Hydrogen embrittlement Microstructure grain boundary engineering

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Microstructure and grain boundary engineering of a novel Fe-Cr-Ni alloy weldment made with self-developed composition-matched weld filler metal

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Transactions of Nonferrous Metals Society of China 2020年第4期30卷 992-1004页

作者： Yu ZHANG Hong-yang JING Lian-yong XU Yong-dian HAN Lei ZHAO Hai-zhou LI Zheng-xin TANG Tian-wang TONG School of Materials Science and engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Advanced Joining Technology Tianjin 300350China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Kunshan Gintune Welding Co. Ltd.Jiangsu 215312China

The microstructure,texture,and yield strength of an advanced heat-resistant alloy weldment made with composition-matched weld filler were *** electron microscopy,energy dispersive spectroscopy,and electron backscatter diffraction were used to characterize the microstructural and textural *** grain boundary engineering(GBE)processes were performed on the *** yield strengths of the weldment at 973 K were obtained before and after GBE processing,and were mostly consistent with the theoretically predicted *** coincident-site lattices,misorientation,and recrystallization of the weld metal after GBE were analyzed,and the results indicate that the increase in dislocation density and the improvement in special grain boundaries in the weld metal are the main reasons for the yield strength elevation of the weldment after *** variation in elongation after high-temperature tests has the same tendency as that in the impact toughness with different GBE parameters,which is related to the coarsening behavior of carbides.

关键词： grain boundary engineering advanced Fe-Cr-Ni alloy weld metal yield strength

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Amelioration of weld-crack resistance of the M951 superalloy by engineering grain boundaries

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Journal of Materials Science & Technology 2021年第19期78卷 260-267页

作者： Mingyue Wen Yuan Sun Jinjiang Yu Shulin Yang Xingyu Hou Yanhong Yang Xiaofeng Sun Yi Zhou Zhou Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research.Chinese Academy of SciencesShenyang110016China School of Materials Science and engineering.University of Science and Technology of China Shenyang110016China Shenyang Liming Aeroengine Cooperation Ltd Shenyang110043China

Fusion weld is a portable and economical joining and repairing method of ***,weld cracks often occur during the fusion weld of Ni-base superalloys,which hinder the applications of fusion weld on this kind of *** this work,the effects of microstructures of grain boundaries(GBs)of the prototype M951 superalloy on its weldability were *** precipitated phases,the elemental segregations on GBs,and the morphologies of GBs can be largely altered by regulating the cooling rates of pre-weld heat *** decreasing the cooling rate,chain-like M_(23)X_(6)phase precipitates along the GBs,accompanying segregations of B,and GBs becomes more serrated in *** fusion weld,the engineered GBs in the M951 superalloy with a low cooling rate favor the formation of the continuous liquid films on GBs,which together with the serrated GB morphology significantly prevents the formation of weld *** findings imply that the weld-crack resistance of the superalloys can be ameliorated by engineering GBs.

关键词： Fusion weld Superalloys M951 Weld-crack resistance grain boundary engineering

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